Argument used to specify the weekday of a date. The value should be provided as an integer and can be any of TtsSpan.WEEKDAY_SUNDAY, TtsSpan.WEEKDAY_MONDAY, TtsSpan.WEEKDAY_TUESDAY, TtsSpan.WEEKDAY_WEDNESDAY, TtsSpan.WEEKDAY_THURSDAY, TtsSpan.WEEKDAY_FRIDAY and TtsSpan.WEEKDAY_SATURDAY. Can be used with TtsSpan.TypeDate.